# Proposed AD FAA-2015-5539: Turbomeca S.A. Turboshaft Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-08-16
- Products: Turbomeca
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 4, 2016, 81 FR 30
- Comments due: March 4, 2016
- Became: [AD 2016-08-16](https://openairdocs.org/ad/2016-08-16)
- Docket: FAA-2015-5539 (https://www.regulations.gov/docket/FAA-2015-5539, where comments are filed)
- Project: 2015-NE-37-AD
- FR document: 2015-32963
- Official PDF: https://openairdocs.org/files/sha256/a3/82/a3824ac03b4991fc1cb295cab5700b1ad34bd5c3cbc02167e2919063a431e98b (from https://www.govinfo.gov/content/pkg/FR-2016-01-04/pdf/2015-32963.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/01/04/2015-32963/airworthiness-directives-turbomeca-sa-turboshaft-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/303DDF0B047D7A0286257F30005B0974.0001
- Page: https://openairdocs.org/proposed/FAA-2015-5539

## Summary

We propose to adopt a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 2E turboshaft engines. This proposed AD was prompted by reports of fuel flow non-conformities found during acceptance tests of Arriel 2E hydro-mechanical metering units (HMUs). This proposed AD would require removing the pre-TU 193 adjusted high- pressure/low-pressure (HP/LP) pump and metering valve assembly and replacing it with a part that is eligible for installation. This proposed AD would also require replacing the constant delta-pressure (delta-P) diaphragm of the fuel metering valve. We are proposing this AD to prevent failure of the delta-P diaphragm, which could result in an uncommanded in-flight shutdown and damage to the helicopter.

## Notices in this docket

- Jan 4, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-32963, comments due Mar 4, 2016 (https://www.federalregister.gov/documents/2016/01/04/2015-32963/airworthiness-directives-turbomeca-sa-turboshaft-engines)

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